Imac 21.5 Retina 4K The idea behind iMac has never wavered: to craft theultimate desktop experience. The best display, paired with high-performanceprocessors, graphics and storage — all within an incredibly thin, seamlessenclosure. And that commitment continues with the all-new 21.5-inch iMac withRetina 4K display. Accuracy. Brightness. Clarity. Regardless of how you measurethe quality of a display, Retina is in a class by itself. The pixel density isso high that you wont detect a single one while using iMac. Text is so sharp,youll feel like youre reading email and documents on a printed page. And witha new, wider colour gamut, the Retina display is able to deliver even moreavailable colours — 25 per cent more. So every photo and video you see appearseven more true to life.